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2.1. Materials and sample preparation The epoxy system consists of a DGEBPA resin and a polycyclic amine hardener ¡£Single-wall carbon nanotubes are added to the resin at 0.2 wt.% with the use of a three-roll-mill. The hardener is stirred into the resin-SWCNT dispersion with a mechanical agitator and the resulting mixture is put under a vacuum to eliminate air bubbles. The samples consist of neat epoxy beams on which a layer of strain sensitive SWCNT composite is coated. The beams are prepared by casting neat resin specimens into aluminum moulds and curing them for 1 h at 80 ¡æ. Subsequently, a coating of the SWNCT¨Cepoxy mixture is applied to the surface of the epoxy at an approximate thickness of 400 um and is cured for a further hour at 80 ¡æ followed by 8 h at 140¡æ. ÈçÉÏËùʾ£¬Çë´óϺÃǸæËßÎÒÕâÖмäµÄbeamÒ»´ÊÈçºÎ·Ò룬ÒÔ¼°ÎªÊ²Ã´ÕâÑù·Òë |
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freefly8898
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4Â¥2011-10-23 23:07:59
bluesky123
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